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Machining human dentin by abrasive water jet drilling
Philipp Kohorst1, Sven Tegtmeyer1, Christian Biskup2
1Department of Prosthetic Dentistry and Biomedical Materials Science, Hannover Medical School, Hannover, Germany.
Bio-Medical Materials and Engineering
|March 20, 2014
Summary
Abrasive water jet machining effectively processed human dentin in vitro. Varying abrasives and water pressures significantly impacted dentin removal rates and cavity dimensions.
Area of Science:
- Biomaterials Engineering
- Dental Materials Science
- Surface Engineering
Background:
- Human dentin processing requires precise and minimally invasive techniques.
- Abrasive water jet (AWJ) machining offers a non-thermal, high-precision machining method.
- Investigating AWJ for dental applications could provide novel treatment modalities.
Purpose of the Study:
- To evaluate the efficacy of abrasive water jet machining for human dentin.
- To determine the influence of different abrasives and water pressures on dentin removal.
- To analyze the morphological characteristics of machined dentin surfaces.
Main Methods:
- In vitro experimental study using 72 human teeth.
- Abrasive water jet machining of root dentin with saccharose, sorbitol, or xylitol at 15 or 25 MPa.
- Analysis of dentin removal depth and volume using stripe projection microscopy.
- Scanning electron microscopy (SEM) for morphological evaluation.
Main Results:
- Dentin removal depth ranged from 142 to 378 μm; abrasion volume ranged from 0.07 to 0.15 mm³.
- Both abrasive type and water pressure significantly affected dentin removal.
- SEM revealed spherical cavities with well-defined margins and slight variations in microroughness.
Conclusions:
- Abrasive water jet machining is a viable and promising technique for human dentin.
- Parameter optimization (abrasive type, water pressure) can control dentin removal characteristics.
- AWJ machining offers potential for precise dental tissue modification.
